Results 21 to 30 of about 2,304 (162)

Invariant Subspaces and Perturbations [PDF]

Proceedings of the American Mathematical Society, 1992
We study the stability of proper closed invariant subspaces with respect to perturbations in norm of continuous operators on a Hubert space, using a nonlinear C
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Proper contractions and invariant subspaces

International Journal of Mathematics and Mathematical Sciences, 2001
Let T be a contraction and A the strong limit of {T∗nTn}n≥1. We prove the following theorem: if a hyponormal contraction T does not have a nontrivial invariant subspace, then T is either a proper contraction of class 𝒞00 or a nonstrict proper contraction
C. S. Kubrusly, N. Levan
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Constrained characteristic functions, multivariable interpolation, and invariant subspaces

Journal of Inequalities and Applications, 2020
In this paper, we present a functional model theorem for completely non-coisometric n-tuples of operators in the noncommutative variety V f , φ , I ( H ) $\mathcal{V}_{f,\varphi,\mathcal{I}}(\mathcal{H})$ in terms of constrained characteristic functions.
Jian Hu, Maofa Wang, Wei Wang
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Group-invariant Subspace Clustering [PDF]

2015 53rd Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2015
Proceedings of Allerton ...
Shuchin Aeron, Eric Kernfeld
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Invariant Subspaces for Derivations [PDF]

Proceedings of the American Mathematical Society, 1988
In this article it is proved that most of the known sufficient conditions for a subspace from Lat A \mathcal {A}
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Convergence of Restarted Krylov Subspaces to Invariant Subspaces [PDF]

SIAM Journal on Matrix Analysis and Applications, 2004
The authors prove estimates for the angle (strictly spoken: for the containment gap) between a searched invariant subspace of a general \(n\times n\) matrix and the subspace generated by Krylov subspace methods like the Arnoldi algorithm or the biorthogonal Lanczos algorithm.
Christopher Beattie, Mark Embree, John Rossi   +2 more
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Generalized 𝑆(𝐶,𝐴,𝐵)-Pairs for Uncertain Linear Infinite-Dimensional Systems

Journal of Applied Mathematics, 2009
We introduce the concept of generalized 𝑆(𝐶,𝐴,𝐵)-pairs which is related to generalized 𝑆(𝐴,𝐵)-invariant subspaces and generalized 𝑆(𝐶,𝐴)-invariant subspaces for infinite-dimensional systems.
Naohisa Otsuka, Haruo Hinata
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Monomial codes seen as invariant subspaces

Open Mathematics, 2017
It is well known that cyclic codes are very useful because of their applications, since they are not computationally expensive and encoding can be easily implemented. The relationship between cyclic codes and invariant subspaces is also well known.
García-Planas María Isabel, Magret Maria Dolors, Um Laurence Emilie   +2 more
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CP symmetry and symplectic modular invariance

SciPost Physics, 2021
We analyze CP symmetry in symplectic modular-invariant supersymmetric theories. We show that for genus $g\ge 3$ the definition of CP is unique, while two independent possibilities are allowed when $g\le 2$.
Gui-Jun Ding, Ferruccio Feruglio, Xiang-Gan Liu
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Automated detection of symmetry-protected subspaces in quantum simulations

Physical Review Research, 2023
The analysis of symmetry in quantum systems is of utmost theoretical importance, useful in a variety of applications and experimental settings, and difficult to accomplish in general. Symmetries imply conservation laws, which partition Hilbert space into
Caleb Rotello, Eric B. Jones, Peter Graf, Eliot Kapit   +3 more
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